01-22-2017, 10:00 AM
The total was between 3.3 and 4.6 million, plus another several hundred thousand outside the US. A group of people made a useful spreadsheet with high and low estimates for each, and sources:
https://docs.google.com/spreadsheets/d/1...true#gid=0
https://docs.google.com/spreadsheets/d/1...true#gid=0